Some years ago, while working at my desk in the office of our home, I heard a noise behind me. I turned and saw a robin, flapping her wings repeatedly against the window. She worked for a very long time but finally left. However, for several days she returned to that same window struggling to get through the glass. I tried turning on lights, moving near the window to shoo her away and I even covered the window with newspapers. Whenever I tried something to get her to stop, she would fly away for a few minutes, only to return shortly and repeatedly bounce against the window.